Reaming-tool



(No Model.)

13'. ,L. MANSFIELD. f

- REAMING TOOL- No. 352,829. Patented Nov. 16, 1886.

1 UNITED STATE TENT cam.

EDWIN LASELLE MANSFIELD, OF BOSTON, MASSACHUSETTS.

REAMlNG-TOOL.

SPECIFICATION forming part of Letters Patent No. 352,829, dated November 16, 1886.

- Application filed September 15,1886. Serial No. 213,616. (No model.)

To all whom it may concern.-

Be it known that I, EDWIN LASELLE MANS- FIELD, of Boston, in the countyof Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Beaming- Tools; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which Figure l is a perspective view of my improved reamer. Fig. 2 is a longitudinal axial section of the same. Fig. 3 is a transverse section on line as w of Fig. 2. Fig. i is a similar section of the reamer adapted to form a tapering surface, and Fig. 5 is a like view of the same adapted'to form a surface of greater taper.

Likeletters of reference indicate corresponding parts throughout the several figures.

My invention has relation to reaming-tools; and it consists in the improved construction and combination of parts constituting thesame, as will be hereinafter fully set forth'.

The object of my invention is to so construct a reamer that it shall produce as accurate work when used in a lathe aswhenoperated by hand, the construction being such that the cutting portion shall be sufficiently self-adj u'stable upon the shank to which it is attached as to adapt itself to follow the center grade. I accomplish this object by providing the shank A with a cylindrical portion, which terminates in a rectangular portion, B. Upon the cylindrical portion is placed a hollow cylindrical cutter-head, G, fluted after the mannor of ordinary fluted reamers, said head being provided at one end with a rectangular opening corresponding to and fitting upon the portion B of the shank, to which it is secured by a washer, D, held in place by a screw, E, turned into the end of the shank. Three or more of the flutes of said head are converted into dovetailed grooves, and into these grooves are placed the cutters F, for cylindrical reaming, or the keys G, fortaper reaming, said keys being thinner at their forward than at their rear ends.

The diameter of the inner cylindrical surface of the head is greater than that of the cylindrical portion of the shank, thus permit dition the cutting is done by the side of the fluted head which is opposite to the keys. In

S Fig. 4 the relative position of the surface cut (shown'by the dotted line) and the parts of the reamer are represented, only one key being used. In Fig. 5 the same is illustrated with two keys in use, in which case the taper formed is of greater degree than that formed when one key is employed.

The edges of the cutters, keys, and grooves converge slightly from the front end toward the back end of the head, so that by striking on the flat end of thecutters and-the large ends of the wedges they may be unseated. One edge of a cutter is beveled and the other concave, which adapts it to fit the dovetailed grooves and to prominently present its outting-edge, while both edges of the wedges are beveled simply to fit the grooves. The ends of the cutters are sharpened in the usual manner, and form,with the concave edges, effective cutting-surfaces.

Having thus fully described my invention, I claim 1. A reamer consisting of a fluted head adjustably connected to its shank.

' 2. A reamer consisting in the combination of a hollow cylindrical cutting-head and a shank formed with a cylindrical portion at one end of less diameter than that of the inner cylindrical surface of said head.

3. The combination of a reamer-head provided with longitudinal dovetailed grooves and cutters reniovably secured in said grooves.

4. The combination of a fluted reamer-head, adjustably secured upon its shank and provided with longitudinal dovetailed grooves,

and keys adapted to be removably secured in "1C0 said grooves.

5. A reamer consisting in the combination of a hollow cylindrical fluted head provided with a rectangular opening in one end; a shank In testimony that I claini the foregoing as provided with a cylindrical portion at oneend my own- I have hereunto affixed my signature which terminates in a rectangular portion, a in-presence-of two witnesses. washer, and a screw for securing the head to EDWIN LASELLE MANSFIELD.

5 the shank, the diameter of the inner eylindri- WVitnesses:

EVERETT KENT DEXTER, J HN WENTWORTH PORTER.

cal surface of the head being greater than that of the cylindrical portion of the shank. 

